The Temple of Mithras is a Roman temple whose ruins were discovered in Walbrook, a street in the City of London, during rebuilding work in 1954. The site was excavated under the guidance of William Francis Grimes, director of the Museum of London in 1954. The temple was built in the mid-3rd century and most probably initially dedicated to Mithras, confirmed by the finding of a head of Mithras himself recognizable from his Phrygian cap. Later, in the early 4th century, the temple was rededicated to Bacchus.